Coffee maker



FIG. 1 is a front perspective view of a coffee maker showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top thereof; and,

FIG. 7 is a bottom thereof.

The broken lines in the drawing depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a coffee maker, as shown and described. 